Jtoxfljff s



this character he of such compos' INLEFERETATE CHEMIGJQL TION 01? NEW? JERSEY.

' No I i-swing.

ii cids properties by internal ictivity as by passage through the mouth of the insect and those which exert their insecticide-i properhy external contact, the latter being known contact insecticides to which int tor chess the insecticides of our invention. be long.

Contact iIlSGCciCldQS are particularly efiioient in the destruction of sop sucking insects and scale insects.

L As the effective results incident to the use of contact insecticides is dependent upon actual contact between the insecticide and the insect, it is essential that they be in such particular form of fume, liquid, orpowder, as to allow of etiicient dissemination between and upon the foliage with. a comparatively complete covering of the seme inordcr to insure a high degree of actual insect. contact. lit is further evident that insecticides of i .ion :is not to otlect, or injure, the foliage when used in.

, sniiicient quantities and strength to hove the desire. tonic e'iiect upon the insects.

Another desirable feature of an insecticide is th at it should he capable of economic production and i'inati'ected in cost on in creased demand.

All. of the above, and other, desirable and valuable properties are possessed by the insecticides of our inveniion.

'We have found that esters producilole from on interaction between alcoholic and carbonic acid have toxic properties of the "greatest value in insecticides and that under proper control. of strength and application do not injuriously afii'cct foliage.

We have further found that the toxic strength of these compounds so great that they can be satisfactorily employed in mixtures of considcrnhle dilution, thusallowing of their employment in mixtures containing a great proportion of inert suhstmicc (nus materially reducing the cost, while-lizivin x' increased casc of application 21(3C( 11)1) L1l 3(l by a maximum of insecticide activity.

Another advantage possessed by the insecticides of our'invention is their copahility of synthetic production. Contact insuits in decreased cost and sell QOMPAIMY, 0F JERSEY CITY, NEW" A. GQELPQRMV :linsnorriciors.

Application filed November 3.5, 1924. Serial Tito. 750,160.

secticides are generally of tion, an increase of demand ing in'inci'eascd selling; price. icolly produced compounds, euci' sectficidcs, an increased demand nets-z this'isct is of thegrcstest oconomi tnnce.

tion are (ii-methyl carbonate, d honate and their hon'iologncs and mers such as 'isoprcpyl inc-Ethylw c and isopropyl ethyl carbonate. By esters, We mean those esters prodncihle from an interaction between aliphatic alcohols and. can

honic acid.

The insecticidal eiiiciency of e mist-mo naturally depends upon the propost 12s oithe toxic esters :inol the iiilutent, and the physical character and chemical properties of the latter.

We give the following as ane'rnnnnie )il't'fw solid, or dusing, insccticidez 08 parts of very finely powdered thoroughly mixed with 2 parts di-ci. bonnie. The resulting mixture con plied to the plant 2151c thereof;

The following" is an example for the production of a liquid insecticide of our invcntion 97 parts of a. neutral soap solution. per cent, is thoroughly mixed With- 3 ports diethyl carbonate and agitated. or coined, until an emulsion is formed. For purposes oi? spraying. 1 part of the above-described stock emulsion is thoroughly mixed with to parts water.

Insecticides mode as shove can he iplied. to plants With.- great insecticidni ch c-ct with out injuriously affecting the foliage.

As :in example oi" method Whcre'oy the ion:- estcrs may he en'iployccl as s. finnigsnt, we give the following m by dustnig it upon the folk A sufficicnt quantity of diethyl carbonate aonoto 5011115 term toxic esters used b F,

;' vboth a single member, bers of that series of R5 lar chemicals,

suitable material toform a homogeneous solid, or semi-solid, mass, which, upon exposure to the air with, or without, artificial heatowill allow of the evolution. of the toxic l fumes.

It is evident that other suitable dilutents may be employed and that members of the toxic esters other than di-ethyl carbonate may be used. 4

By inert dilutent we mean a substance or substances, either gaseous liquid, or solid, which, when used in combination with the toxic esters, will not injurious'ly'afi'ect either applied, but it can be of known insecticidal va ue. v I

It'is evident that a plurality of toXic estors can be used in one mixture, and hence, us in our jelaims and elsewhere is intended to include or a plurality of memchemical compounds.

We do not limit ourselves to the particution, mentione herein, as these are given bonate.

the esters with which it is combined in mix-' ture or the foliage to which the mixture is guantities, or steps of producsimply as a means for clearly describing our inventionyr w l What we claim is 1. An insecticide containing a stable insecticidal ester producible from an interaction between aliphatic alcohols and carbonic.

ac1d..

2. An insecticide 3. In an'insecticide in combina'tioma stable insecticide ester producible from an interaction between aliphatic alcohols and carbonic acid and an inert dilutent. l

4. In an insecticide, in combination, diethylcarbonate and an inert dilutent.

5. In an insecticide in combination, a stable insecticidal toxic ester producible from an interaction between aliphatic alcohols and.

containing di-eth-yl car- I 

